While you wait for answers, we may have found some information which could help you.
Click here for Briggs Stratton EngineBriggs and Stratton SP470?
lawn mower briggs and stratton classic 35?
My Briggs & Stratton 10.5 engine will start but dies after about 15 mins?
lawn mower engine hunting?
Petrol or diesel?
litres of oil needed in a countax c600h ride on lawnmower?